Electric-lamp holder.



V. MARTINEZ ELECTRIC LAMP HOLDER.

APPLICATION FILED APR. 15. 1916.

Patented May 15, 1917.

' INVENTOR. V 117w Maribel BY WW5.

VICTOBINO MARTINEZ, 0F HABANA, CUBA.

ELECTRIC-LAMP HOLDER.

Specification of Letters Patent.

Patented May 15, 1917.

Application filed April 15, 1916. "serial No. 91,469.

To all whom it may concern.

Be it known that I, VICTORINO MARTINEZ, a citizen of the Republic ofCuba, and a resident of Habana, Cuba, have invented certain new anduseful Improvements in Electric- Lamp Holders, of which the following isa specification.

The invention relates to receptacles for incandescent electric lamps.The principal object of this invention is to provide an improvedconstruction of s'ucha lamp receptacle which presents a new arrangementof terminals and properly forms a unipolar circuit breaker, whereby theordinary bipolar circuit breaker provided with a fusible wire in the twoelectric conductors'is displaced.

Further objects embrace the provision of a. receptacle which isconstructed of less metal and more wood, whereby the cost of manufactureis reduced; to arrange the fusible wire without affecting a compactarrangement; and to obviate injury to the cutout element upon securingor removing the lamp.

Further objects will'become apparent by reference to the specificationand to the claims defining the scope of the invention.

In the accompanying drawing,

Figure 1 is a front view of a receptacle constructed in accordance withthe invention and containing the incandescent lamp.

Fig. 2 is a longitudinal section through the receptacle and a view ofthe lamp.

Figs. 3 and 4 are opposite views of the terminal-carrying block arrangedinside of the receptacle, and

Fig. 5 is a horizontal section of the terminal-carrying block.

The receptacle is composed of a lengthened socket 1 made out of wood orother cheap insulating material, and is reinforced by a metallic ring 1'surrounding the lower extremity of the socket. In the interior of thesocket a terminal-carrying block is provided consisting of a solidcylinder 2 of insulating material, such as caoutchouc, porcelain. or anysuitable solidified paste. The axial passage 3 extends throughout thelength of the cylinder or member 2 and leads to a circular recess 4 atthe lower extremity of said block. A metallic pin 5 is received in saidpassage which is provided at its lower end with a head 6, which forms aninner terminal. The other end of the pin is longitudinally slotted, asat 7, whereby prongs 7 are formed which operate in the manner of aspring and serve to retain the pin in the block 2. The member 2 also hason its periphery two diametrically opposed longitudinal recesses 8 and9, in the first of which a smaller metallic plate 10 of square shape isarranged and secured by means of a screw 11. In the second recess alate. 12 is secured by a screw 14, which is ormed integral with a spring13 forming the outer terminal. Both plates 10 and 12 are electricallyinterconnected by means of a fusible wire 15 disposed in a. helicalgroove 16 formed on the periphery of the block 2 and extending betweenthe recesses 8 and 9. The ends of the fusible wire 15 are secured underthe small plates 10 and 12 by the appertaining screws 11 and 14.

\Vires 17 and 18 from any electric circuit are introduced into thesocket 1 through an opening 19 at the upper end thereof. The end of thewire 17 is forced into the slot 7 formed between the two prongs 7 of thepin 5, whilethe end of the other wire 18 is wound around the screw 11and secured by the same.

The socket is provided at its lower end with interior screw threads 20to receive the metallic screw threaded base 21 of the incandescent lamp22. hen the base 21 is screwed into the socket 1 it comes in contactwith the spiral spring 13 compressing the same until the central contact23 of the base 21 engages the inner terminal 6 of the member 2, thusclosing the circuit through the filament of the lamp 22 and alsomaintaining the block 2 in proper position. The block 2 forms a unipolarcircuit breaker or cut-out as the fusible wire 15 connects the contactplates 10 and 12, to the former of which the contacting wire, 18 leads.The provision of the member 2 substitutes bipolar circuit breakersorcut-outs ordinarily used in electric lighting circuits.

I am aware that various changes may be made in the construction andarrangement of the parts without departing from the spirit of myinvention, and I want to avail myself of all changes and alterationswhich fairly fall within the scope of my invention, as pointed out inthe appended claims.

I claim 1. In combination with an electric lamp socket, a block ofinsulating material arranged therein, said block being provided with acentral passage and with longitudinal recesses at its periphery, contactplates Cir mounted in said peripheral recesses, a fusible Wireinterconnecting said contact plates, and a contact pin arranged withinsaid central passage.

2. In combination with an electric lamp socket, a block of insulatingmaterial arranged therein, said block being provided with a centralpassage and with longitudinal recesses at its periphery andinterconnected by a helical peripheral groove, contact plates mounted insaid peripheral recesses, a fusible wire arranged in said helical grooveand interconnecting said contact plates, and a contact pin extendingthrough said central passage.

3. In combination with an electric lamp socket, a cylindrical block ofinsulating material' arranged therein, said block being provided with acentral bore and with longitudinal recesses at its periphery atdiametrically opposite points interconnected by a helical peripheralgroove, contact plates mounted in said longitudinal recesses, a fusiblewire arranged in said helical groove and interconnecting said contactplates, and a pin slotted at its upper extremity extending through saidcentral bore, one of said contact plates being extended and bent to forma spring adapted to contact with the lamp base.

In testimony whereof I aflix my signature hereunto.

VICTORINO MARTINEZ.

